diff --git a/Gruntfile.js b/Gruntfile.js
index c60e600ab8..4e713d7c85 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -1,6 +1,6 @@
 /* jshint node: true */
 
-module.exports = function(grunt) {
+module.exports = function (grunt) {
   "use strict";
 
   // Force use of Unix newlines
@@ -40,6 +40,21 @@ module.exports = function(grunt) {
       }
     },
 
+    jscs: {
+      options: {
+        config: 'js/.jscs.json',
+      },
+      gruntfile: {
+        src: ['Gruntfile.js']
+      },
+      src: {
+        src: ['js/*.js']
+      },
+      test: {
+        src: ['js/tests/unit/*.js']
+      }
+    },
+
     concat: {
       options: {
         banner: '<%= banner %><%= jqueryCheck %>',
@@ -288,6 +303,7 @@ module.exports = function(grunt) {
   grunt.loadNpmTasks('grunt-contrib-watch');
   grunt.loadNpmTasks('grunt-html-validation');
   grunt.loadNpmTasks('grunt-jekyll');
+  grunt.loadNpmTasks('grunt-jscs-checker');
   grunt.loadNpmTasks('grunt-recess');
   grunt.loadNpmTasks('grunt-saucelabs');
   grunt.loadNpmTasks('grunt-sed');
@@ -296,7 +312,7 @@ module.exports = function(grunt) {
   grunt.registerTask('validate-html', ['jekyll', 'validation']);
 
   // Test task.
-  var testSubtasks = ['dist-css', 'jshint', 'qunit', 'validate-html'];
+  var testSubtasks = ['dist-css', 'jshint', 'jscs', 'qunit', 'validate-html'];
   // Only run Sauce Labs tests if there's a Sauce access key
   if (typeof process.env.SAUCE_ACCESS_KEY !== 'undefined') {
     testSubtasks.push('connect');
diff --git a/js/.jscs.json b/js/.jscs.json
new file mode 100644
index 0000000000..2f04d9cd61
--- /dev/null
+++ b/js/.jscs.json
@@ -0,0 +1,14 @@
+{
+    "requireSpaceAfterKeywords": ["if", "else", "for", "while", "do", "switch", "return"],
+    "requireSpacesInFunctionExpression": { "beforeOpeningCurlyBrace": true },
+    "disallowLeftStickedOperators": ["?", "+", "-", "/", "*", "=", "==", "===", "!=", "!==", ">", ">=", "<", "<="],
+    "requireRightStickedOperators": ["!"],
+    "disallowRightStickedOperators": ["?", "/", "*", ":", "=", "==", "===", "!=", "!==", ">", ">=", "<", "<="],
+    "disallowSpaceAfterPrefixUnaryOperators": ["++", "--", "+", "-", "~", "!"],
+    "disallowSpaceBeforePostfixUnaryOperators": ["++", "--"],
+    "requireSpaceBeforeBinaryOperators": ["+", "-", "/", "*", "=", "==", "===", "!=", "!=="],
+    "requireSpaceAfterBinaryOperators": ["+", "-", "/", "*", "=", "==", "===", "!=", "!=="],
+    "disallowKeywords": ["with"],
+    "validateLineBreaks": "LF",
+    "requireLineFeedAtFileEnd": true
+}
diff --git a/js/dropdown.js b/js/dropdown.js
index 13352ef7cf..b84d219bd2 100644
--- a/js/dropdown.js
+++ b/js/dropdown.js
@@ -85,7 +85,7 @@
 
     if (e.keyCode == 38 && index > 0)                 index--                        // up
     if (e.keyCode == 40 && index < $items.length - 1) index++                        // down
-    if (!~index)                                      index=0
+    if (!~index)                                      index = 0
 
     $items.eq(index).focus()
   }
diff --git a/js/modal.js b/js/modal.js
index 3ead5ee88b..5544cf04e0 100644
--- a/js/modal.js
+++ b/js/modal.js
@@ -180,7 +180,7 @@
     } else if (!this.isShown && this.$backdrop) {
       this.$backdrop.removeClass('in')
 
-      $.support.transition && this.$element.hasClass('fade')?
+      $.support.transition && this.$element.hasClass('fade') ?
         this.$backdrop
           .one($.support.transition.end, callback)
           .emulateTransitionEnd(150) :
diff --git a/js/tests/unit/scrollspy.js b/js/tests/unit/scrollspy.js
index 06219a1c8d..1b546a5799 100644
--- a/js/tests/unit/scrollspy.js
+++ b/js/tests/unit/scrollspy.js
@@ -19,7 +19,7 @@ $(function () {
       test("should switch active class on scroll", function () {
         var sectionHTML = '<div id="masthead"></div>'
           , $section = $(sectionHTML).append('#qunit-fixture')
-          , topbarHTML ='<div class="topbar">'
+          , topbarHTML = '<div class="topbar">'
           + '<div class="topbar-inner">'
           + '<div class="container">'
           + '<h3><a href="#">Bootstrap</a></h3>'
diff --git a/js/tests/unit/tooltip.js b/js/tests/unit/tooltip.js
index 2139dc8117..cc559ccb61 100644
--- a/js/tests/unit/tooltip.js
+++ b/js/tests/unit/tooltip.js
@@ -290,7 +290,7 @@ $(function () {
       test("should place tooltips inside the body", function () {
         var tooltip = $('<a href="#" rel="tooltip" title="Another tooltip"></a>')
           .appendTo('#qunit-fixture')
-          .tooltip({container:'body'})
+          .tooltip({container: 'body'})
           .tooltip('show')
         ok($("body > .tooltip").length, 'inside the body')
         ok(!$("#qunit-fixture > .tooltip").length, 'not found in parent')
@@ -301,7 +301,7 @@ $(function () {
         var container = $("<div />").appendTo("body")
             .css({position: "absolute", width: 200, height: 200, bottom: 0, left: 0})
           , tooltip = $("<a href='#' title='Very very very very very very very very long tooltip'>Hover me</a>")
-          .css({position: "absolute", top:0, left: 0})
+          .css({position: "absolute", top: 0, left: 0})
           .appendTo(container)
           .tooltip({placement: "top", animate: false})
           .tooltip("show")
@@ -347,7 +347,7 @@ $(function () {
               .tooltip('show')
           , tooltip = container.find(".tooltip")
 
-        ok( Math.round(target.offset().top + target[0].offsetHeight/2 - tooltip[0].offsetHeight/2) === Math.round(tooltip.offset().top) )
+        ok( Math.round(target.offset().top + (target[0].offsetHeight / 2) - (tooltip[0].offsetHeight / 2)) === Math.round(tooltip.offset().top) )
         target.tooltip('hide')
       })
 
diff --git a/js/tooltip.js b/js/tooltip.js
index 8debad96be..d3bf41fb23 100644
--- a/js/tooltip.js
+++ b/js/tooltip.js
@@ -133,7 +133,7 @@
   }
 
   Tooltip.prototype.show = function () {
-    var e = $.Event('show.bs.'+ this.type)
+    var e = $.Event('show.bs.' + this.type)
 
     if (this.hasContent() && this.enabled) {
       this.$element.trigger(e)
diff --git a/package.json b/package.json
index 813cf1d135..3c9fd7fe66 100644
--- a/package.json
+++ b/package.json
@@ -32,6 +32,7 @@
     , "grunt-contrib-watch": "~0.5.3"
     , "grunt-html-validation": "~0.1.6"
     , "grunt-jekyll": "~0.4.0"
+    , "grunt-jscs-checker": "~0.2.5"
     , "grunt-recess": "~0.5.0"
     , "grunt-saucelabs": "~4.1.2"
     , "grunt-sed": "~0.1.1"